Vacuum tube



Oct. Y I a uoxxggPn VACU M inn: 1 I f Filed April 20,1921! MVen/or:

' MY/I'am G flow/reaper? Patented Oct; 27, 1925:

I UNITED STATES PA NT "OFFICE.

WILLIAM G. KOUSKEEPEB, or NEW YORK, n. 2., assumes 'ro wEs'rEaN mum comm, mconrom'rnn, or NEW Yoax, 1w. 1., a conroaanon or'maw YORK.

vacuum rm Application filed April to, on. sum No. 402,818.

3. The lower end ofthe anode is sealed'to To all whom it may concern:

Be it known that I, WILLIAM G. Hoos- KEEPER, a citizen of the United States, residing at New York, in the county of New York, State of New York, have invented cer-.

tain new and useful Improvements in Vacuum Tubes, of which the following is a full, clear, concise, and exact description.

This invention relates to vacuum tubes and more especially to vacuum tubes of the audion type. p v

In my copending application Serial No. 396,014, filed July 13,1920, is disclosed an audionin whichthe anode comprises a portion of the enclosing vessel, the cathode and grid being supported between insulating plates carried by a tubular member extending axially of the vessel and being enveloped by the cathode and grid of substantially cylindrical configuration. In certain instances it is desirable to remove the supporting member from its axial position in the tube because of the intense heat to which it is subjected in that position through radiation from the enclosing cathode.

It is the object of this invention to pro: vide, in a tube of the above noted character,

.a structural arrangement whereby the means for maintaining the insulating lates in their spaced relation, is removed rom the hot part of the tube and also whereby the spacing means is utilized as a current carrier. The object isv accom lished by supporting one of the insulating plates from the stem of the enclosing vessel and supporting the second plate from the first plate by means of metal rods mounted in the first plate near the periphery thereof. Between the two plates are arranged a cathode and grid, the cathode being located between the supporting hooks and the rods acting as toning a wire. such as the wire 2, to the I ment locates the rods 13 for maintaining the outside thereof. The anode is open at its lower end, which is flared out gradually. at

tubularmetallic member 10 which extends through a plate 11 of insulating material, preferably lavite. Surrounding the member 10 and interposed between the plate 11 ber '9. Supported from the member 9 is a and the cross member 9 is a sleeve 12, by

means of whichthe plate11 is spaced from the member 9.

Mounted in the plate 11 near the eriphery thereof are metal rods 13,'preferab y molybdenum, which are held in position by meansof-nuts 14. The upper ends of these rods are offset as shown at 15 and are attached to a second block of lavite 16 bymeans of nuts 17. Extending between the block's 11. and 16 .and arranged exterior of-the rods 14 are wires '18 upon which is helically wrapped the conductor 19 constituting the grid electrode. The plate 11 is provided with six symmetrically arranged upwardly extending hooks and the plate 17 with four symmetrically disposed downwardly extending hooks 20. Interiorly of the'rods 13, a two part filamentary cathode 21 is strung between the hooksin such a manner as-to assume asubstantially cylindrical configuration, the ends of each part of thecathode bein at-' tached to the offset. upper ends' 15 o the rods 13. To the lowerends of the rods 13 are attached the lead wires 22. which are sealed in the stem 5 at'th'e inner end thereof.

A lead wire 23 is provided for the grid electrode and is led out through the tubular.

member 6. The cathode is maintained under uniform tension by means of the springs 24 operating in conjunction with the lower hooks 20. This construction is described in detail and claimed in my United States electrode structure from approaching too closely the anode 1.

The above described structural arrangeinsulating plates in their desired relation insulating plate supported from said stem,

rods mounted in said plate near the periphery thereof, a second lnsulating plate supported by said rods and a filamentary cath- V ode'strung between said plates, each end of said cathode being connected to one of said rods adjacent said second plate.

2. An electron discharge device comprising an evacuated vessel having a stem, an insulating plate supported from said stem, rods mounted in said plate near the periphery thereof, a second insulating plate'supported by said rods, a filamentary cathode strung between said plates, each end of said cathode being connected to one of said rods adjacent said late and a control electrode surrounding said cathode and said rods.

3. An electron discharge device'comprising an evacuated vessel.having a stem, an insulating plate supported from said stem, rods mounted in said plate, a second plate supported bysaid rods, a filamentary cathode supported between said plates, each end of said cathode being connected with one of .said rods near one end thereof and lead wi'es connected with the other ends of said ro s.

4. An electron discharge device comprising an evacuated vessel having a stem, an insulating plate supported from said stem, rods mounted in said plate near the periphery thereof, said rods being ofi'set inwardly at their upper ends, a second insulating plate carried by said rods and a filamentary cathode strung between said plates interior] of said rods, said cathode being substantially cylindrical in configuration and having its engs attached to the ofiset portions of said to s.

5. An electron discharge device coinpris- In witness whereof, I hereunto subscribe my name this 18th day of April A. 1)., 1921.

WILLIAM G. HOUSKEEPER. 

